[ Java实例 ] 1 - 简易版计算器

[ Java实例 ] 1 - 简易版计算器

文件结构：

运行结果：

代码：（复制可用）
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package App;

import java.awt.EventQueue;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.border.EmptyBorder;
import javax.swing.JLabel;
import javax.swing.JButton;
import java.awt.Font;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.ButtonGroup;
import javax.swing.SwingConstants;
import java.awt.GridLayout;
import java.awt.Dimension;

public class MainFrame extends JFrame {
   
	
	private static final long serialVersionUID = 3272128285111488657L;
	private JPanel contentPane;
	private final ButtonGroup buttonDigit = new ButtonGroup();
	private final ButtonGroup buttonControl = new ButtonGroup();
	private final ButtonGroup buttonGroup = new ButtonGroup();

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
   
		EventQueue.invokeLater(new Runnable() {
   
			public void run() {
   
				try {
   
					MainFrame frame = new MainFrame();
					frame.setVisible(true);
				} catch (Exception e) {
   
					e.printStackTrace();
				}
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MainFrame() {
   
		this.setTitle("杨北林的简易计算器");
		this.setSize(450,480);
		this.setLocationRelativeTo(null);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 355, 411);
		contentPane = new JPanel();
		contentPane.setBorder(new EmptyBorder(5, 5, 5, 5));
		setContentPane(contentPane);
		
		JLabel lbresult;
		contentPane.setLayout(new GridLayout(0, 1, 0, 0));
		
		JPanel panel_text = new JPanel();
		contentPane.add(panel_text);
		panel_text.setLayout(new GridLayout(0, 1, 0, 0));
		
		JLabel lbshow = new JLabel("");
		panel_text.add(lbshow);
		lbshow.setHorizontalTextPosition(SwingConstants.CENTER);
		lbshow.setFont(new Font("新宋体", Font.PLAIN, 32));
		
		lbresult = new JLabel("0");
		panel_text.add(lbresult);
		lbresult.setVerticalAlignment(SwingConstants.TOP);
		lbresult.setMaximumSize(new Dimension(32, 0));
		lbresult.setHorizontalAlignment(SwingConstants.LEFT);
		lbresult.setHorizontalTextPosition(SwingConstants.CENTER);
		
		lbresult.setFont(new Font("Adobe Garamond Pro Bold